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Noah Smick, Brian Labombard C-Mod Ideas Forum, December 2006. Experimental Plan for the New Wall-Actuated Scanning Probe (WASP). Wall-Actuated Scanning Probe (New for ’07). New Capabilities: Measurements up to and beyond LCFS Multi-Electrode Capabilities

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experimental plan for the new wall actuated scanning probe wasp

Noah Smick, Brian Labombard

C-Mod Ideas Forum, December 2006

Experimental Plan for the New Wall-Actuated Scanning Probe (WASP)

Wall-Actuated

Scanning Probe

(New for ’07)

New Capabilities:

Measurements up to and beyond LCFS

Multi-Electrode Capabilities

(e. g. fluctuation induced fluxes)

Cross-field flow information

Well-controlled plunge dynamics

(To Be Replaced with a second WASP)

Diagnostic Arrangement

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Experimental Plan for the New Wall-Actuated Scanning Probe (WASP)

Noah Smick, Brian Labombard

C-Mod Ideas Forum, December 2006

Planned Experiments:

  • New diagnostic “shake down” run day during start-up to exercise probes, optimize scan motion. There are several issues to address here:
    • Verify Mechanical functionality of the probe
    • Explore our ability to control probe plunge dynamics by adjusting driving waveforms
    • Explore the probe physics associated with the new Gundestrup-like probe tip geometry vs. old probe tips.
      • Are the small systematic differences in parallel flow velocity with new tip geometry on 6/13/06 real? Which is correct?
      • Do we trust the ability of these probes to measure cross-field flow?
      • Are the general flow trends previously measured reproduced?

1 startup run day: ohmic 5.4T 800kA with density scan, USN LSN DN, to touch with previously measured flow data. All three scanning probes and divertor probes to be operated.

  • L-Mode Experiments:
    • Get inner wall flow data during SSEP scan to inform SOL flow modeling (UEDGE, per request by A. Pigarov, UCSD).

Data at left shows SSEP scan with density measurements [1]. What do the flows do across the region of steep density gradient?

1 run day 5.4T 800kA with Density, SSEP scan including USN, LSN and near-balanced DN’s.

1st Gundestrup-like probe

Current Gundestrup-like probe tip, to be installed on all C-Mod scanning probes for ‘07

[1] Boswell, et al., Plasma Phys. Control. Fusion 46 (2004) 1247.

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Experimental Plan for the New Wall-Actuated Scanning Probe (WASP)

Noah Smick, Brian Labombard

C-Mod Ideas Forum, December 2006

Planned Experiments:

  • L-Mode Experiments:
    • Revisit , mhd SOL phase space.

This is an open mini-proposal (#409) that can benefit from the enhanced flow-measurement capabilities of the new probes.

1 run day to revisit standard discharges and continue to explore phase space, including new HFS and cross-field flow data

    • Some models predict flow reversal in the HFS near-SOL. Increased operational depth of WASP will allow us to investigate this.
    • Could the flow loop be closed by an inward pinch on the HFS? The multi-electrode WASP can address this by measuring fluctuation induced fluxes.
  • H-Mode Experiments
    • Probe Ohmic H-Mode transitions (See Labombard, “Ohmic L-H Threshold Experiments”, this forum.)
    • Potential for Operation in RF Heated H-Modes without rectification-corrupted Te measurements (based on single-pass absorption of RF waves)  pedestal physics, QC mode investigations.

Parallel Flow Reversal on HFS

WASP Probe

A. Pigarov, “Asymetries in Unbalanced Double-Null Divertor Configurations”, Oral presentation, 48th Annual Meeting of the Division of Plasma Physics, Philadelphia, PN, 31 Oct. 2006